www.tnb.comUnited StatesTel: 901.252.8000 800.816.7809Fax: 901.252.1354

Technical ServicesTel: 888.862.3289

A-2

Overview

Boxe

s &

Cov

ers

— S

teel

City

® M

etal

lic B

oxes

Advantages of Steel City® Boxes and Covers

Notched Ears on Switch Boxes• Steel City® Switch Boxes feature

a longer ear and a special notch. This provides clearance for the screws that are used to attach wall plates to GFCI or rocker-type light switches

Raised Ground Screw Bump in 4" Square, 411⁄16" and Utility Boxes• Quicker surface mounting by

eliminating the need to remove the portion of the screw that threads through the back of the box

• Allows for improved repositioning of grounding conductor

• Ground bump standard in 21⁄8" boxes

• Ground bump optional in 11⁄2" boxes

MS Bracket Boxes• Mounts without the use of screws

• Mounts to the open or closed side of the stud

• Works on stud depths up to 4" Pre-Installed Screws are Packaged in Raised Position• Eliminates extra step of having

to back out the screw during cover installation

Steel City® switch and outlet boxes are protected from rust and corrosion by zinc-galvanizing. All clamps and other component parts are electrogalvanized separately, before assembly in the box, to ensure corrosion protection of every surface. Steel City® galvanized finish meets the requirements of Underwriters Laboratories, Inc. and Federal Specifications.

Eccentric Knockouts on Square Boxes• Provide better contact with

conduit fitting and locknut to the box, improve grounding path, stronger than 3⁄4" knockout

• Available in all four standard-size square boxes

• Improved 3⁄4" knockout position on square boxes

• Less labor required to install 3⁄4" conduit to box

Steel City® is the industry-leading product line of metallic switch and outlet boxes used in electrical construction. Since 1904, Steel City® products have symbolized the highest quality standards in manufacturing and innovative design, with one of the most complete offerings available.

Steel City® products are known for their simple improve ments, such as being the first box offering to standardize combination slotted/phillips screws on all boxes. Thomas & Betts is also recognized as a leader in design innovation, as in our new metal stud bracket.

Thomas & Betts continues to listen to contractors and responds to their ever-changing needs. Contact a T&B distributor nearest you to select the right Steel City® product for your requirements.

Steel City® Metallic Boxes and Covers

United StatesTel: 901.252.8000 800.816.7809Fax: 901.252.1354

Technical ServicesTel: 888.862.3289www.tnb.com

A-3

Boxes & Covers —

Steel City® M

etallic Boxes

OverviewGuide to Steel City® Knockouts, Pryouts, Ears, Brackets and Clamps

Knockouts and PryoutsSteel City® conduit KOs have standard trade size dimensions. KOs are uniform and true for attachment of cable or conduit connectors. Pryouts for cable entrance are slotted — a twist with a screwdriver removes them. KOs and Pryouts are precision stamped to permit easy removal, but remain sufficiently strong and sturdy when not removed.

Outlet Box EarsMounting ears support the box independent of the electrical system attachments. Switch boxes have a fixed ear for old work installations.

Ears for plaster are set 1⁄16" forward of the box face in position for old work (modernization), except where specifically noted.

Tapped Holes for GroundingAll Steel City® boxes have a 10-32 tapped hole in the bottom of the box for attaching separate ground wire.

Brackets

Clamps

3⁄4" Conduit KO 1" Conduit KO

Knockouts

DV TypeMounts box offset from stud 11⁄2". 613⁄16" long x 1" wide x 11⁄2" offset

MS Type (For Metal Studs)Mounts to any depth of metal stud,

open or closed side. 21⁄2" long x 111⁄16" wide x 3⁄8" offset;

Far side support to 4" only

S or B TypeMounts to face of stud. Used on

switch, handy or square boxes. 2" long x 21⁄8" wide

T TypePositions handy box against the face and side of stud.

51⁄2" long x 7⁄8" wide

SV TypeMounts box to side of stud with

positioning spikes. 73⁄8" long x 1" wide x 3⁄8" offset

CV Type (Outlet Boxes)Mounts to flat

side of metal studs or wood studs.

73⁄8" long x 1" wide x 3⁄8" offset

7⁄8" 13⁄32"13⁄8"

1⁄2" Conduit KO

C-5C-1

C-8(Loom only)

C-10 C-3

L TypeUsed to mount octagon boxes.

25⁄8" long x 35⁄8" wide x 1⁄4" offset

For Non-Metallic Sheathed Cable and Non-Metallic Tubing (Loom)UNDERWRITERS LABORATORIES INC. and CANADIAN STANDARDS ASSOCIATION file numbers for individual items available upon request.

For Armored Cable

Listing Information for Armored Cable Clamp — Type C-3

Armored Cable (BX) — Steel Sizes 14-2 through 10-3Armored Cable (BX) — Aluminum Sizes 14-2 through 10-3MC Interlocked (MCI) — Steel .449–.570 DiameterMC Interlocked (MCI) — Aluminum .476–.606 DiameterMC Corrugated (MCC) — Aluminum .375–.515 Diameter

MCAP™— Aluminum* .370–.580Flex Metal Conduit — Steel 1⁄8" Trade SizeFlex Metal Conduit — Aluminum 3⁄8" Trade SizeC-3 Clamp Acceptable for Grounding* MCAP™ is a trademark of Southwire Company

Eccentric Knockouts

Combination 1⁄2" & 3⁄4" Knockout

Pryouts

Cable Pryouts Always in Pairs

21⁄32"

V TypeMounts to flat side of stud.

73⁄8" long x 1" wide x 3⁄8" offset

“Products listed in this catalog are subject to alteration or discontinuation without prior notice.”